I just bought a pair of some High Flow acrylic filter socks from a company in the UK, and they work amazing! Here is a shot of the bottom and the side of what these acrylic filter socks look like. They will drop right in your 4'' hole in your sump. They slide right in where you would original install your filter socks at on your sump. Filter socks are now the thing of the past. No more buying new socks every month, no more washing them in our washing machine with bleach etc, etc. Ones i Get them in I will install my pair of DreamBox - Silencer // Filter socks inlay so you don't hear any type of water going down the socks..

acrylic filter socks

acrylic filter socks

Dreambox-Silencer // Filter socks - inlay

My custom made sump 36x15''

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Others have asked and I would like to know who you got those from as well. I wonder if they will ship to the US as those look nice.

i ordered the one from marine depot just because im tired of changing the socks. The one you posted looks good, but the diameter is 4.4 in so it would be a tad to big. Ill let you guys know if the ones from marine depot are any good

I don't use filter socks but for those who do are they submerged in the water or above the water line? Most of the image searches show them submerged. My curiosity wants to know how that effects nitrates and phosphates.

i ordered the one from marine depot just because im tired of changing the socks. The one you posted looks good, but the diameter is 4.4 in so it would be a tad to big. Ill let you guys know if the ones from marine depot are any good

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If you go to a pond shop they will have those black ones in different sizes, they are called "net cups" "netcups" .. And they come also transparent and white... search for them on Google and you will find them closer to your home than you expected.

i ordered the one from marine depot just because im tired of changing the socks. The one you posted looks good, but the diameter is 4.4 in so it would be a tad to big. Ill let you guys know if the ones from marine depot are any good

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I ordered the marine depot ones as well. The cups themselves did not fit in my sump as the lip is way to small and just dropped through the hole cut for my filter socks. When I contacted MD they said this was a known issue and why they offer the cups with an additional ring attachment. I thought from the pics the ring was just for the C style sock holders but apparently you need them for some sumps as well. MD did me a solid and sent me one of the rings to try in my sump and see if those would work. I didn’t have a chance to try it out before leaving for a thanksgiving trip but will see if it works when I return.

Maybe try contacting the guy at filterbag.com and asking if they've made socks for the Red Sea Reefers (if they're different than the Max's socks) and had success with making them. Or maybe you could send him a sock that's almost out of commission so they can make it fit identically, but not clog like that. It's the ring of the sock, I assume, why you can't use other socks?

Because they make filter socks for EVERY type of industry (aquarium, oil and gas, ect...) and every aspect of the sock is customizable from the micron rating, size of the sock, felt or mesh and if you want polypropylene felt or regular, plastic rim at the top, regular or drawstring.

Because even if they have to custom make them, which is what I did, I can almost guarantee they would be much cheaper than $10. The only thing with a custom order is you need to get at least 25 socks minimum, unless, like you said, you find another way around it.

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I did get in contact with filterbag.com and the fellow I spoke to said they would have to get their plastic ring vendor to make a mold and minimum order for them would be 25,000. They have a company that only supplies them with the plastic rings and they attach your requested material. Red Sea knew what they were doing.
I did get with BRS to ask if they would be able to have someone to have these made. No word yet.

I bought the media cups for a 525xl sump and in about 2 minutes I can toss the dirty floss and replace it with new floss. Been using for 3 weeks and nitrates are still 0, but I also have an awesome skimmer.

Buy a big block of aquarium foam, cut into a round shape about a 1/4 wider than the cup diameter, and insert to the bottom. Make an extra set to have on standby. These rinse easily under the faucet and you can also place filter floss on top to extend the change out time.